if($session->is_expired)
  {
      print $cgi->header(-cache_control=>"no-cache, no-store, must-revalidate");
      print "<p>Your has session expired. Please login again.<p></br>";
      print "<a href='http://localhost//cgi-bin//mml%20log//login.pl'>Login</a>";
  }
  elsif ($session->is_empty)
  {
      
      print $cgi->header(-cache_control=>"no-cache, no-store, must-revalidate");
      print "You have not logged in";
  }